I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
galago gulag gallica clag gleg glug glogg calico colugo gallic
galago lag logo flag vulgo clag colugo gulag slag
gala galah gal gaily gale galea galeae gall galley gally gaol gayly goal goalie egal